(Otosan was a calm and caring person. He's the one who created Sun Breathing. He was the one who gave birth to me, Goku Tsugikuni. Sometimes, I feel like I'm some sort of protagonist of some TV series or manga. Why do I always have to save everyone? Why do I have to jump in at the last minute? I've been fighting for hours. I'm tired, I'm hungry, I want to go home... Can't I just leave and leave Muzan to someone else? Can't I let this to be someone else's problem?)
(No.)
(That's not what otosan want me to do. He wants me to defeat Muzan. What am I thinking? Leaving? Not even in a lifetime. If I leave now, Muzan'll never be defeated. If I leave now, Muzan will win. And I will not allow this.)
"This is your end, Muzan!"
"Sun Breathing: Thirteenth Form -- Perpetual Light!"
Goku threw at Muzan. Once again, as if for magic, the Demon King saw Yoriichi behind Goku. And somehow, Goku was Yoriichi himself. "You disgust me..." said Muzan, countering. Goku flew in the air, behind Muzan, but still looking at him with his only remained eye. Then, he landed on the air and kept attacking with Perpetual Light, cutting Muzan's arm. With the sword in his teeth, he was shielding himself, while he was attacking with the sword in his hand.
The two of them clashed nonstop. Rengoku's eyes fluttered open. "Goku-kun..." he muttered. But he was unable to move. (Please... Win for us...)
"Fourth Form -- Burning Bones, Summer Sun!" exclaimed Goku, shielding himself. (I have to hold on... If I keep going like this, I'll fully become a demon... I can already see my skin getting darker, this means I'm becoming more and more demonized...) he reflected while fighting. Muzan tried to stab the Sun Hashira on the throat, but Goku dodged just in time. "Even if I only have an eye, I can see your movements! I have the access to the Transparent World!" he exclaimed. "I had guessed it!" said Muzan, attacking again. "Tenth Form -- Fake Rainbow," said Goku, disappearing. The boy arrived from above, trying to slice Muzan's body in half, even if he knew this wouldn't have kill him.
"Ninth Form -- Fire Wheel!" exclaimed the boy, who did manage to slice Muzan's body in half. Unfortunately, the two halves took a bit to reattach. (I've gained time... I'm using otosan's sword right now, so if I manage to hit him, it'll mean he'll need about five or six second to fully regenerate...) thought Goku. "You parasyte..." said Muzan, once fully regenerated. "You look horrible with that pink-gray tumour on the face."
"You provoked me it, you remember?" said Goku. "Thirteenth Form -- Perpetual Light!" he repeated, attacking again using the twelve previous forms of Sun Breathing. Once the clash was over, Goku jumped in the air. "Blood Demon Art: Shining Sun Flames!" he exclaimed, stabbing Muzan in the brain. Then, he digged even deeper and moved his sword to the side. "UUUAAAAARRGH!" screamed Muzan. "Does it hurt, motherfucker? I don't feel sorry!" exclaimed Goku, jumping away before Muzan could counterattack. "Blood Demon Art: Turbo Sun!" exclaimed the Sun Hashira, dashing forward and cutting three of Muzan's arms. "Since when you can use Blood Demon Art?" asked Muzan. "Since my fight with my uncle, you know?" said Goku, landing on a wall of a building.
"Take these!" exclaimed Muzan, sending his arms to Goku. Goku sued the force on his legs to dash forward. "Ninth Form -- Fire Wheel!" he said, slicing most of Muzan's arm and arriving in front of him. Then, the two of them clashed once again. Suddenly, Muzan felt a strange sensation.
(What's happening...? His movements are not so fast, and they're even weak... Then why I can't land the decisive blow on him...? Maybe it's because I'm slowing down too, or a one-against-one fight would never last so long. I ate Tamayo's cells, but I guess she won't tell me what else her drug does, aside from turning me back into a human... I'll look inside her memories.)
Looking inside Tamayo's memories, Muzan saw Shinobu. "Let's mix two poisons with the assumption he can resist one. The first one should turn demons back into humans... And the second one could be a perfect aging poison."
(Age! I get it! I'm aging!) realized Muzan. (My body is deviating strength to fight aging. That's why I'm struggling against the Hashiras and the hidden sun... How many time since Tamayo gave me the drug? Four... no, five. If I take off the time needed to starting make effect, it's circulation since less time. In other words... I'm getting nine-thousands years older! But wait... Tsugikuni gave me the drug to make me age, so... It's his fault!)
"Caw! Fifty-nine minutes until sunrise!" exclaimed Rin. "What's wrong, old man? Are you worried?" asked Goku. "You're looking older."
"You weren't lying when you said that things would make me age!" exclaimed Muzan, attacking again. "No, I definitely wasn't!" replied Goku, countering. (Even if he's aging, I'm getting tired too... I won' last another hour...)
Far away, Shinobu and Muichiro were tending at the others' wounds. "Are you okay, Inosuke? You need the serum!" exclaimed Muichiro, once they reached the unconscious Inosuke. "Himejima, can you hear me?" asked Yushiro. "Even if he regains senses, it'd be impossible for him to fight anymore..." he realized.
(If I lose concentration, my quadruple power-up will disappear... I have to focus and hit his brains and hearts with precision...) thought Goku, while dodging. Suddenly, Goku got smashed away, but someone arrived to save him. Goku shook his head and saw Obanai. "Obanai!" he exclaimed. "Don't worry, I'm aware of what I'm doing. If I didn't save you, you'd smash your head on the debris and lose consciousness," said Obanai. He had a claws-like cut on the face and couldn't see.
"I'll cover your back, you think about attacking Muzan. I can still fight thanks to Kaburamaru, my snake..." said Obanai. Then, Goku got launched in the sky. "Fine!" he exclaimed. (I have to aim well...)
Muzan destroyed an entire building in the attempt to hit Obanai, but the Serpent Hashira dodged in time and leapt on a wall. "Sun Breathing...." started to say Goku. "A stupid animal like that snake is passing him informations...?" wondered Muzan... "Twelfth Form -- Flame Dance!" Goku finished the phrase, attacking Muzan once again. Then, he jumped away on a wall.
(Our attacks and the drug I gave him have weakened him...) thought Goku, landing on the floor. (Even if it's a two-against-one, it's not easy! Obanai has helped me a lot of times, so I have to help him this time!)
Suddenly, Goku noticed some scars on Muzan's body. (Those scars... Otosan's provoked them to him! After all, he burned this motherfucker cellularly. Those are his weak points! Otosan is showing me how to win, even now!)
"What's going on, piece you shit? You can't hide your scars anymore?" said Goku, his voice muffled by the sword in his teeth. "Shut up!" exclaimed Muzan, attacking him. (The other gained precious time while I was knocked off, so I have to win now! I'm going to give it my all!) thought Goku.
"Fourty minutes until dawn!" exclaimed Rin. "Thanks for the information, my beloved crow!" said Goku. "Hey, Obanai, take these!" he then exclaimed, grabbing one of Yushiro's eyes and throwing it to Obanai. But then, the piece of paper got destroyed. When the dust settled, Goku saw Muzan was running away. "Obanai! Muzan is running away!"
(Of course he is,) thought Obanai. (He's not a proud samurai or a human who acts basing on his emotions... He's just a being who only cares about his life, and the fact the sun is rising is surely a peril to him!)
While running away, Muzan stepped on the demon slayers' corpses. But suddenly, he felt one - no, a lot of swords stabbing his back. Muzan turned and saw Goku was throwing the fellen demon slayers' swords to him. "I won't let you run away!" he exclaimed. Suddenly, Obanai jumped and stabbed Muzan in the nechk, piercing his throat. In that moment, Goku seized the occasion and threw another one of Yushiro's eyes to Obanai. "With this, you'll share sight with Kaburamaru!" he said. But once again, Muzan attacked and the piece of paper got lost. To counter, Goku and Obanai used their respective techniques. "It got lost once again!" exclaimed the Sun Hashira. "I have no idea where Goku threw it..." said Obanai. "Kabumararu, take it!" exclaimed Goku.
Without hesitating, Kaburamaru used his mouth to grab a piece of paper with Yushiro's eyes and placing it on Obanai's forehead. "Goku... Thanks."
Obanai used his Serpent Breathing and arrived to help Goku. "It's not like human sight, but I can see anyway!" said the Serpent Hashira. "Fighting is way more easy this way!"
"Don't let him run away!" said Goku. "Got it!" said Obanai. (They keep try obstacolate me... Don't get in the way, you insignificants beings!) thought Muzan. But suddenly, Muzan realized something.
(I'm short of breath! My physical strength won't last long! I can't believe it!)
(Hold on, myself!) thought Goku, struggling to even stay on his feet. (I feel life... They're returning. Those annoying Hashiras...) thought Muzan. (It's Tsugikuni's fault if I didn't manage to finish them off...)
"Thirty-five minutes until sunlight!" exclaimed Rin. (This fight is over... I have to risk even further...) thought Muzan. But then, mid-fight. Goku felt something.
(Nezuko-chan... She's back human... I'm so happy...) he realized. But then, Goku noticed Muzan was trying to split his body. "Obanai, he's trying to divide!" exclaimed the boy. Suddenly though, the Demon King stopped. "I... I can't split!" he said. "He stopped!" said Goku, relieved. "Oops, I may have forgotten something. The drug I gave you not only made you age, it also prevented you from splitting!"
"I HATE YOU, PIECE OF SHIT!" screamed Muzan. But then, he spat blood. (Yes! It's working!) thought Goku. (We can win! It's almost sunrise!)
Suddenly, Muzan seemed like to explode. Goku and Obanai got sent flying away. When Goku opened his left eye again, he saw a hole had opened inside Muzan's chest. (I... I can't move... I'm having convulsions! Muzan'll win!) he thought. (No. It won't happen.)
(That attack crushed my lungs... My right lung collapsed!) realized the boy. (No problem, I still have a lung...) he then said, slowly getting up. But suddenly, when Muzan was about to escape, Inosuke arrived, attacking him. "HOW DARE YOU HURT MY BOSS?!?" he yelled, enraged. (I can't use my techniques... Is this fatigue...?) wondered Muzan. "Boss lost an eye and two fingers, the blind guy lost a leg, the guy with the mispatched haori lost an arm, they were my comrades! Give their limbs back! Thei lives! And if you can't, then die!" exclaimed Inosuke.
Rapidly, Inosuke attacked Muzan, but the Demon King impaled him with one of his techniques. (No! I have to protect him!) thought Goku. "Stay..." he muttered. "STAY AWAY FROM MY BEST FRIEND!"
Suddenly, Zenitsu arrived, saving Inosuke. "Inosuke, don't worry, aniki is standing right there!" he said. "Aniki! Focus on remaining alive, you hear me? Don't die! Nezuko-chan'll be back human, and you and Shinobu will live a happy life together!"
"I... I won't, Zenitsu-kun..." muttered Goku. Zenitsu got smashed against a wall by Muzan, but Inosuke saved him in time. (If a Blood Demon Art is invading my body... Then a Nichirin Sword should be effective!) muttered Goku. Then, he spat his katana and grabbed his father's. (I'll kill Muzan with otosan's sword... I've decided!)
Without hesitating, Goku stabbed himself with his sword, nullifying the Blood Demon Art's effect. (These insignificant gnats! I crush them, but they keep returning!) thought Muzan.
While Inosuke and Zenitsu handled Muzan, Sanemi, Giyuu, Rengoku and Gyomei returned. Goku turned and saw them. "Let's end this," he said. "Yes," said Rengoku. "Let's go."
"Sun Breathing: First Form -- Dance!" exclaimed Goku, cutting Muzan's arm right before he could kill Inosuke. "Boss!" exclaimed Inosuke. "Watch closely, Inosuke-kun. Watch your aniki defeat this motherfucker!" said Goku. But then, he spat blood. "I have to hold on..."
"Thunder Breathing: Seventh Form -- Honoikaizuchi no Kami!" exclaimed Zenitsu, cutting Muzan on the back. "Seventh Form -- Sunflower Thrust!" exclaimed Goku, attacking once again. "Seventh Form -- Honoikaizuchi no Kami!" said Zenitsu once again. "Ninth Form -- Sun Halo Dragon Head Dance!" said Goku. "Raging Sun!" he said once again.
"Seventh Form -- Sunflower Thrust!" and with this attack, Goku stabbed Muzan in the place where the hole on his chest was, piercing him against a wall.
(I can't use any other technique.... I have to end this, NOW!) thought the boy. Just when Goku was about to be hit by Muzan, someone blocked him: Mitsuri. "Stop it right there, moron!" she said. "Mitsuri-chan!" exclaimed Goku. The girl got sent away. From the sky, Sanemi arrived, slicing Muzan in half. Muzan's mouth opened like the mouth of a octopus. Sanemi flew away, and the Demon King bit off Goku's left arm. (No matter what, I can't give up!) said Goku, baring the pain of having an arm bit off. To make things even worse, Muzan bit off Goku's index and middle fingers of his right hand. The boy lost his grip on his katana, but suddenly, from behind, Rengoku arrived, helping him holding the katana. "Set your heart ablaze!" they screamed in unison. Muzan spat even more blood. To protect himself, Muzan wrapped himself in a baby-like form. "He grew bigger!" said Goku. Then, with his left foot, Goku kicked Rengoku away, and then, he got wrapped by the baby-like form. "Goku-kun!" screamed Rengoku. But Goku disappeared.
Muzan tried to walk away in his baby form, but the remaining slayers gave everything they had to keep him on place. Sanemi jumped in again. "Wind Breathing: Ninth Form -- Idaten Typhoon!" he exclaimed. Then, in a final act of heroism, Gyomei wrapped the belt of his spiked flail around Muzan's neck, smashing him on the floor. But even so, Muzan tried to dig underground. "Water Breathing: Tenth Form -- Constant Flux!" said Giyuu.
But then, from the inside, Muzan felt hit.
"Sun Breathing: Tenth Form -- Fire Wheel."
From inside Muzan, Goku had attacked, wounding him. And finally, the sun completely rose, and after what seemed an eternity...
Every nightmare disappeared. Every struggle paid off. No one lost their life in vain. Finally, Muzan got burnt by sunlight, and he died, signaling the end.
It's over.
Chapter 73 - End.